Projection apparatus



June 1961 D. J. ALBERT ETAL 2,985,957

PROJECTION APPARATUS Filed June 26, 1956 12 Sheets-Sheet 1 DOMLD J. ALBERT ROBERT N .FERRY IN VEN TORS A ORNEY & AGENT June 6, 1961 ALBERT ETAL 2,986,967

PROJECTION APPARATUS Filed June 26, 1956 12 Sheets-Sheet 2 iii 57 if FIG. 2.

DONALD J. ALBERT ROBERT N. FERRY INVENTORS A TORNEY & AGENT June 6, 1961 D. J. ALBEVRT EIAL PROJECTION APPARATUS l2 Sheets-Sheet 3 Filed June 26, 1956 FIG. 12.

DONALD J. ALBERT ROBERT N. FERRY INVENTORI)- RMZY & AGENT June 6, 1961 ALBERT ETAL 2,986,967

PROJECTION APPARATUS Filed June 26, 1956 12 Sheets-Sheet 4 FIG.4.

c B I A /7/ I72 FIGS.

190mm) J. ALBERT ROBERT N. FERRY INVENTORS ATTORNEY & AGENT June 6, 1961 D. J. ALBERT ETAL 2,986,967

PROJECTION APPARATUS Filed June 26, 1956 12 Sheets-Sheet 5 DOMLD J. ALBERT ROBERT N. FERRY INVENTORS BY T ORAEY & AGENT June 6, 1961 D. J. ALBERT EI'AL PROJECTION APPARATUS 12 Sheets-Sheet 6 Filed June 26, 1956 N whm %$& AGENT mmm m A 3 Wm p mm\ m& 5 3K 1| .VW\ I N NM\ June 6, 1961 D. J. ALBERT ETAL PROJECTION APPARATUS l2 Sheets-Sheet 7 Filed June 26, 1956 DONALD J. ALBERT ROBERT N. FERRY INVENTORS A TORNEY & AGENT D. J. ALBERT EFAL PROJECTION APPARATUS June 6, 1961 12 Sheets-Sheet 8 Filed June 26, 1956 FIG.14.

DOMQLD JALBERT ROBERT N. FERRY INVENTORS BY wv/J? ATTORN EYJLAGENT Lil June 6, 1961 D. J. ALBERT ETAL PROJECTION APPARATUS 12 Sheets-Sheet 10 Filed June 26, 1956 June 6, 1961 D. J. ALBERT ETAL PROJECTION APPARATUS 12 Sheets-Sheet 11 Filed June 26, 1956 i H mm m NXNN. v 0 G B T A -3u H F wfm & F H H m JNW. j JV hpl m km mm mm vb R T H Q 8 NQ DR t w .8 1 we ma w 0 59 E QB E a a j -m N0 1/. q 8 5 V v um Mk3 Na D uw .V" hw r NOuu P. N I. m E x x F A Eu vi NE E G3 8.3 3 mg. .x mQmdke 29E WQMWkSwEQkk Ohxqww E xoQN :35. 2 ABM i W PI .W I L... Ni N \1 wm N5 36 M U r 2% 5R w H a. \n -m H H u NEw .5 Cu MU Be m" u wvot Mn QM m n H mm 3 Na. .i NH im E MY g %Q% v i. LI o on 8. om 6 5m Qm June 6, 1961 D. J. ALBERT ETAL PROJECTION APPARATUS QONUNL DONALD J. ALBERT RoBERT N. FERRY 1N VEN TORS By -w Q72,

TTORNEY & AGENT I I l I I I l I I I I l Ill-I N385 ku fitt 4 United States Patent 2,986,967 PROJECTION APPARATUS Donald J. Albert and Robert N. Ferry, Rochester, N.Y., assignors to Eastman Kodak Company, Rochester, N.Y., a corporation of New Jersey Filed June 26, 1956, Ser. No. 593,858 25 Claims. (Cl. 88-44) The invention relates to photographic projection apparatus in which relatively small photographic elements having a plurality of images arranged thereon both longitudinally and transversely of each element are antomatically handled and transported by the app-aratus to project all and selected images onto successive areas of unexposed light-sensitive material.

In projection apparatus used for enlarging normal negative or positive film, such film is usually of a size which readily lends itself to manual manipulation by the operator. Generally, such films are placed in a suitable negative carrier which is then positioned in the enlarger with respect to the optical system. Apparatus in which the images are arranged on a film strip may be provided with either automatic or manual means for intermittently advancing the film strip and light-sensitive material. However, in such apparatus the advancement of the film strip as well as any selection of the images to be projected is controlled by the operator.

In the present invention, the size of each photographic element is such that it cannot be handled or manipulated readily by the operator and, as a result, must be handled and transported during the projection cycle without any control thereover by the operator. Since each element contains indicia indicative of the type of image thereon as Well as its location, the projection of each image or selected images is controlled by the element. This is accomplished by loading or stacking a plurality of elements in a supply station from which each element is removed and transported from the supply station through a reading station and into a projecting station. As the element is moved through the reading station, the indicia indicating that an image is to be projected provides a signal which is stored in a memory device. Upon entry into the projecting station, the carrier causes release of the stored signals, which, in turn, controls the intermittent movement of the carrier through the projecting station, the projection of the images, the movement of the optical system and the advancement of the lightsensitive material. After the last image has been projected, the carrier is moved to a receiving station into which the element is then inserted, the carrier retfurning to its original position with respect to the supply station for receiving the next element for a repetition of the same cycle of operation. Since each element may contain difierent types of images, as described hereinafter, it is possible by means of a selecting means to project all images, selected images or type of image, the selecting means being set by the operator and the control being accomplished by the indicia on the element.

The primary object of the invention is, therefore, to provide a projection apparatus in which the cycle of operation is controlled by indicia on the element to be projected.

Another object of the invention is to provide a projection apparatus in which each element is moved from a supply station through a reading station and into a projecting station in which signals derived from the indicia on the element control the intermittent movement of the element through the projecting station, the projection of the images and the advancement of the light-sensitive material.

Still another object of the invention is to provide a projection apparatus for elements having images arranged longitudinally and transversely thereof and indicia for indicating such images in which the indicia control the intermittent movement of the element through the projecting station, the movement of the optical system transversely of each element, the projection of each image and the advancement of the light-sensitive material.

A further object of the invention is to provide a projection apparatus for elements having images arranged longitudinally and transversely thereof and indicia for indicating all and selected images to be projected and type of image to be projected, the indicia providing signals for controlling the cycle of operation when the element is in the projecting station.

And yet another object of the invention is to provide a projection apparatus for elements having images arranged longitudinally and transversely thereof and indicia for indicating all and selected images and type of image to be projected in which signals are derived from the indicia, as the element is moved through a reading station, and stored in a memory device, the signals being released when the element is positioned in the projecting station to control the movement of the element through the projecting station, the movement of the optical system, the projection of all and selected images and of types of images, and the advancement of the lightsensitive material.

Other objects and advantages will be apparent to those skilled in the art by the description which follows. Reference is now made to the accompanying drawings wherein like reference numerals designate like parts and wherein:

FIG. 1 is a perspective view of the projection apparatus in which the most important elements are shown and in which the exposure station is shown diagrammatically and out of position to obtain a complete disclosure;

FIG. 2 is a front elevation of the projection apparatus and showing the relative positions of the supply, reading, projecting and receiving station;

FIG. 3 is a right side elevation showing the various elements of the mechanism for controlling movement of the optical system transversely of the element;

FIG. 4 is a plan view of the projection apparatus;

FIG. 5 is an enlarged detail view of a photographic element and showing the relation of the various indicia to the image and code areas;

FIG. 6 is an enlarged front elevation with certain parts removed and showing various mechanisms associated with the drive means and the arrangement for moving the carrier means;

FIG. 7 is an enlarged plan view of the various mechaanisms associated with the drive means for operating the reciprocative means at the supply and receiving stations as well as the carrier means and optical system;

FIG. 7A is a detail view of the vacuum control atrangement associated with the receiving station;

FIG. 8 is a side elevation of the projection apparatus and showing the relation of the exposure station, the path of the light-sensitive material, and the processor;

FIG. 9 is a detail side elevation of the mechanism for actuating the reciprocative means associated with the supply station;

FIG. 10 is a detail section taken substantially along line 1010 in FIG. 9;

FIGS. 11 and 12 are detail views of the operating mechanism for the glass platen in the projecting station;

FIGS. 13 and 14 are detail views of the clutch mechamsm;

FIG. 15 is a vertical section through the lamp housing and showing the optical system therein;

FIG. 16 is a vertical section through the reading station and showing the illuminating system and the position of i the light-responsive means;

FIG. 16A is a detail view showing the arrangement of the light-responsive means in the reading station;

FIG. 17 is a detail plan view of the carrier means and showing the relation of the indicia thereon to the indicia on the element when it is positioned on said carrier means;

FIG. 18 is a diagrammatic chart showing the sequence of operation of the various control cams for a cycle of operation as an element'is moved from the supply station to the receiving station;

FIGS. 19A and 19B comprise a wiring diagram shown partially in block diagram for the complete projecting apparatus; and

FIGS. 20A, 20B and 20C are detail circuit diagrams for the blocks indicated in FIG. 19A.

Reference is made to FIG. in which the photographic element disclosed is of the type for which the apparatus about tobe described is-utilized. Such a photographic element 30 is a piece of either negative or positive film approximately five-eighths of an inch wide and one and one-quarter inches long. At one end, element 30 is provided with an elongated aperture 31 in which a stick or rod can be inserted for handling and transporting a large number of such elements as a unit. 'Element 30 comprises an image area 32 in which a plurality of images are arranged longitudinally and transversely ofsaid element and a code area 33 in which code is arranged in columns longitudinally of the element and in rows transversely of the element. Each row of code has a reference or timing mark 34 associated therewith, said marks indicating the presence of code in their respective row. In the element disclosed in FIG. 5, the images are arranged in pairs-transversely of element 30 and six such images are arranged longitudinally with each image equivalent to a predetermined number of rows of code. While in the element disclosed in FIG. 5 ten rows of code are equivalent to the width of an image, this number can be varied as well as the number of images both longitudinally and transversely of the element. The number of images can also be varied from twelve, as shown, to two in which case the code area can vary from ten to sixty lines of code. Adjacent each pair of images indicia 35 and 36 are arranged longitudinally of element 30 and in the last two columns of code. Indicia 35 on the inner line of code designate a type of image different from that indicated by indicia 36. For example, image 5 can be an abstract of image 6 or related thereto; in other words, the image 6 can be that of a full page document, a map, a photograph, etc., whereas image 5 is an abstract of the document, a list of points of interest on the map, a description relating to the photograph, etc. With respect to images 9 and 10, however, the order is reversed; that is, image 9 is the document image and image is the abstract or related image. As will be described more fully hereinafter, indicia 35 and 36 are utilized to derive signals therefrom only when such abstract images are to be projected. When all or selected images are to be projected, signals are then derived only from indicia 36. Since the element 30, as shown in FIG.

5, is moved to the right as it is transported through the is designated by 36-12. If only selected images are to be projected, the indicium 36 for each image not to be projected is blanked out by means of an aperture 37 punched in the film, as indicated by dotted lines in FIG. 5. Since signals are then derived only from the indicia 36 present on the element 30, only these images will be projected. As shown in FIG. 5, since apertures 37 negate indicium 36-4, 36-7, 36-11 and 36-12, only images 1, 2, 3, 5, 6, 8, 9 and 10 will be projected.

With reference to FIGS. 1, 2 and 4, elements 30, which are handled in a group by means of the stic inserted in aperture or slot 31, are positioned in supply magazine 40 in a vertically extending stack. Magazine 40 is open at both ends and is provided at the lower end with lips, not shown, for marginally engaging the lowermost element to support the stack. Magazine 40,-therefore, comprises the supply station, designated broadly by the nu meral 41, and is pivotally mounted at 42 on bracket 43 which, in turn, is secured to plate 44 carried by support member 45 on frame 46, magazine-40 being locked in an upright position by stud 47 which is pivotally mounted on pin 48 and threadably engages plate 49 extending from magazine 40.

Magazine 50, which is identical to magazine 40, comprises the receiving station 51 and is pivotally mounted on bracket 52 at 53, said bracket being secured to plate 54 carried by support member 55 on frame 46. Stud 47, pin 48, and plate 49 are identical to those shown with respect to magazine 40. As'will be described more completely hereinafter, magazines 40 and 50 are capable of having elements 30 withdrawn therefrom or inserted therein by reason of the marginal lips and the manner in which the elements are withdrawn and inserted.

Projecting station 56 is arranged between supply station 41 and receiving station 51 and comprises a housing 57 which is slidably mounted on rods 58 and 59 which, in turn, are mounted in bracket 60 and 61 fixed to the top of frame 46, see FIGS. 3 and 6. Housing 57 is movable along rods 58 and 59 transversely of element 30 to position the optical axis 0A of optical system 62 with respect to the image to be projected, as described hereinafter. Optical system 62 comprises a reflector 63 for lamp 64, a condenser lens system 65 including lenses 66 and 67 and a heat absorption plate 68, a mirror 69, an auxiliary condenser system 70 including lens 71 and 72, and a projection lens 73, as shown in FIG. 15. System 70 and lens 73 are positioned on opposite sides of element 30 to permit movement of said element therebetween.

Between supply station 41 and projecting station 56, a reading station 74 is mounted on bracket 75 which is fixed to frame 46. Reading station 74 includes a lamp 83, mirror 84, two spaced lenssystems 76, and a plurality of light-responsive cells 77 which are arranged on plate 82, as shown in FIG. 16A. Cell 78'derives a signal from each of indicia 35, cell 79 derives a' signal from each of indicia 36, cell 70 derives a signal from each of reference marks 34, and cell 81 derives a signal from carrier means 85 for element 30 in the manner about to be described.

The carrier means 85 comprises a plate 86 which is secured to support 87 and is'provided with an aperture 88 of the shape best shown in FIG. 17. When element 30 is positioned on plate '86 and with respect toaperture 88, it is maintained in position and properly located by pin 89 which engages slot 31, by studs 90 and 9-1 which engage one side of element'30, and by the edge of the cut-away portion of stud 92 on the opposite side, the cutaway portion permitting the edge thereof to be adjusted with respect to element 30 to provide the best spacing between said studs for insuring the positioning-and removal of the element with respect to plate 86.- Spaced from element 30 and corresponding to thepossible number of images thereon, a plurality of apertures 93 are arranged in alignment with indicia 36. I It -is' from these apertures that cell 81 derives a series of signals.

As shown in FIGS. 9 and 10, support87 is slidably mounted on spaced rods 94 and 95 which extend between supportmembers 45 and 55. An adjustablestop 96 is mounted in support 87 between rods 94 and 95. On the bottom of support 87, a block 97 is secured thereto and is provided on the underside thereof witha plurality of ratchet teeth 98, the number of teeth corresponding to the number of images longitudinally of element 30 and being spaced such that each tooth serves to index .an image on element 30 with respect'to optical axis OA and optical system 62 when the element is-in projecting station 56. Since optical system 62 is movable transversely of element 30, plate 86 need only be indexed longitudinally to successively align each of one longitudinal group of images with respect to projecting station 56 and movement of said optical system into alignment with the proper image is controlled in a manner to be described with respect to the electrical controls in conjunction with the mechanical components.

The drive means comprises motor 100 which is mounted on bracket 101 fixed to frame 46, as shown in FIG. 9, and the drive mechanisms connected to and deriving their movement from said motor. Motor 100 drives pulleys 102 and 103 fixed to shaft 104 through a gear box or speed reducer 105, as shown in FIGS. 1 and 4. A mechanism plate 106 is mounted between support members 45 and 55 and shaft 107 is journaled in said plate, see FIG. 7. Shaft 107 has a pulley 108 fixed to the end thereof on the rear side of plate 106 and is rotated by means of belt 109 connecting pulleys 102 and 108. By

means of electromagnetic clutch CC, shaft 107 drives shaft 99 which extends through plate 106 and carries a timing pulley 110 which is on the front side of plate 106. Shaft 99 also has fixed thereto a winding core 111 which with supply core 112 adjacent thereto and freely rotatable on shaft 113 forms with spring 114 a springmotor 115. At the opposite end of plate 106, a pulley 116 is freely rotatable on shaft 117. Timing belt 118 has its ends fixed to support 87 and encircles pulleys 110 and 116. Upon energization of clutch CC, therefore, support 87 and plate 86 fixed thereto and serving as a carrier means for element 30 are moved from a position with respect to supply station 41, past reading station 74, into projecting station 56, and into a position with respect to receiving station 51. During this movement, which is continuous with the exception, under certain conditions, that the movement through the projecting station is intermittent, spring 114 is wound from core 112 onto core 111 and when support 87 is released from its position in either projecting station 56 or receiving station 51, spring motor 115 will return carrier means 85 to its original position with respect to supply station 41.

As shown in FIGS. 1, 6 and 9, pulley 103 drives shaft 1'20 by means of belt 121 and pulley 122 fixed to said shaft. Shaft 120 is journaled in plate 106 and in bracket 60 and has a pulley 123 fixed to one end adjacent plate 106 and a bevel gear 124 fixed to the other end. Bevel gear 124 drives a mating gear 125 fixed to the end of vertical shaft 126 to which a bevel gear 127 and a pulley 128 are fixed, see FIG. 7. Bevel gear 127 mates with gear 129 which is freely rotatable on shaft 130 and which has fixed integral therewith or secured thereto ratchet 131 which forms a part of clutch 132, as shown in FIGS. 13 and 14. Ratchet 131 forms, therefore, the driving member of clutch 132 and is continuously driven from shaft 104 and pulley 103. The driven member 133 of clutch 132 comprises a pawl 134 which is pivotally mounted at 135 on flange 136 of sleeve 137 fixed to shaft 130. Pawl 134 is biased by spring 138 into engagement with ratchet 131 to drive shaft 130 and is provided with an externally extending nose 139. Adjacent clutch 132, a solenoid MC is mounted on plate 140, see FIGS. 3 and 4, which has associated therewith a linkage comprising bell crank levers 141 and 142 which are pivotally mounted at 143 and 144, respectively, to plate 140 and biased toward clutch 132 by springs 145. Arms 146 and 147 of the respective bell crank levers 141 and 142 are pivotally connected at 148 to armature 149 of solenoid MC. Arms 150 and 151 are arranged in the path of nose 139 on pawl 134 and serve as stops to limit the rotation of shaft 130 to one-half of a revolution upon each actuation of solenoid MC. From FIG. 3 it is evident that momentary energization of solenoid MC causes armature 149 to be moved to the left whereby both of levers 141 and 142 are pivoted in opposite directions with arm 150 being withdrawn from engagement with nose 139 thereby permitting spring 138 to 6 soon as solenoid MO is de-energized, springs return levers 141 and 142 to their original positions and arm 151 is then positioned in the path of nose 139 and upon abutting it rocks pawl 134 out of engagement with ratchet 131 to arrest any further rotation of shaft 130.

At the left end of shaft 130, see FIGS. 7 and 9, a cam 154 is fixed thereto and actuates a follower 155 on arm 156 of bell crank lever 157 which is pivotally mounted at 158 on plate 159 and biased against cam 154 by spring 160. Arm 161 of lever 157 is pivotally connected at 162 to plunger 163 which is slidably mounted in block 164 and aligned with supply station 41 and magazine 40. Plunger 163 is provided with a rectangular shaped head 165 which is of dimensions permitting said head to be moved through aperture 88 in plate 86 and into the lower open end of magazine 40. A blind hole 166 extends from head 165 into plunger 163 which is also provided with a connecting port 167. Cam 154, in the position shown in FIG. 9, is ready upon the next actuation of solenoid MC and when plate 86 is in position with respect to magazine 40 to move lever 157 in a counterclockwise direction whereby head 165 of plunger 163 is moved through aperture 88 and into contact with the lowermost element 30 in magazine 40. Shortly before the instant this occurs, port 167 is aligned with vacuum line 168 whereby the lowermost element is withdrawn past the lips in magazine 40 by the vacuum applied thereto and deposited in proper position on plate 86 and with respect to aperture 88, as shown in FIG. 17. At the instant, the withdrawn element 30 is placed on plate 86, port 167 is past vacuum line 168 so that the vacuum is no longer effective and the element is released. This arrangement comprising cam 154, lever 157, plunger 163 and the related elements comprises, therefore, the reciprocative means for withdrawing an element from the supply station and depositing it in proper relation with respect to the carrier means.

With reference to FIGS. 4 and 7, the right end of shaft 130 is journaled in block 170 and has cams MCA and MCB fixed thereto on one side of said block for actuating closed contacts MCAl and MCA2 and open contacts MCBl and MCB2 and cams 171 and 172 fixed thereto on the other side of said block. Bell crank levers 173 and 174 are pivotally mounted on a common shaft 175 journaled in bracket 176 and have arms 177 and 178, respectively, which carry followers 179 and 180 for engaging their respective cams. Arms 181 and 182 of said levers are pivotally connected at 183 and 184 to plungers 185 and 186, respectively. Plunger 185 is slidably mounted in block 187 for movement through aperture 88 when plate 86 is in the receiving station 51 and into the lower open end of magazine 50 to remove the element 30 from plate 86 and insert it in magazine 50. Cam 171 and cam 154 are identical and positioned on shaft 130 so that they are 180 out of phase. With this arrangement, each half revolution of shaft 130, upon energization of solenoid MC will actuate either plunger 163 or plunger 185 depending on the cycle of operation. Plunger 186, see FIG. 7A, is a valve control for vacuum line 188, that is, plunger 185 is provided with a blind hole 189 which extends inwardly from head 190 and a side port 191 which is capable of movement with respect to a connecting port 192. Plunger 186 is provided with a reduced neck portion 193 for controlling the connection of atmospheric port 194 and vacuum port 195 with port 192. Cam 172 is phased with respect to cam 171 such that the vacuum is effective at the instant head 190 of plunger 185 engages element 30 on plate 86 and remains effective until said element is inserted in the lower open end of magazine 50. While cams 154, 171 and 172 are rotated as a unit with shaft 130, cam 154 is operative only during one half revolution of said shaft whereas cams 171 and 172 are only operative during the other half revolution, clutch 132 being a half revolution clutch .I O Q P 134 into g ent with ratchet 131. A II as noted hereinbefore. This arrangement comprises the 7 reciprocative means for removing element 30 from carrier means 85 and inserting it in receiving station 51.

By means of belt 198, pulley 128 drives pulley 199 on shaft 200, see FIG. 3, pulley 199 being associated with a clutch 201 which is identical to clutch -132. Shaft 200 also carries cams LCA, LCE and LCD which actuate normally closed contacts LCAl, LCO1 and LCO2 and normally open contacts LCEl, LCE2 and LCE3. As shown in FIG. 7, clutch 201 is controlled by solenoid LC which has an armature 202 to which bell crank levers 203 and 204 are pivotally connected at 205. Levers 203 and 204 are pivotally mounted at 206 and 207, respectively, on plate 208 and have arms 209, 210, 211 and 212, arms 21 1 and 212 serving to release and stop clutch 201, as described above with respect to clutch 132. Shaft 200, which is driven by clutch 201, carries a cam 213 at its upper end for engaging follower 214 which, in turn, is carried on the underside of housing 57. As solenoid LC is energized, clutch 201 is released for onehalf revolution thereby rotating cam 213 and moving optical axis CA from the center of an even image, 2, 4, 6, 8, or 12 to the center of an odd image 1, 3, 5, 7, 9 or 11, or vice versa, depending on the location of the image to be projected and the position of axis 0A as discusssd more fully hereinafter. It is to be understood, of course, that housing 57 is moved on rods 58 and 59 only transversely of element 30, the proper image areas being moved into projecting position by plate 86 and belt 118.

Glass platen 217 is carried by plate 218 secured to collar 219 which, in turn, is fixed to tubular shaft 220. Bracket 221 provides a mount in which shaft 220 is slidably mounted. Bracket 221 is slidably mounted on rods 222 and 223' for horizontal movement, said rods being secured in brackets 60 and 61 and spring 228 biasing bracket 221 to the left, as viewed in FIGS. 6 and 12. Shaft 220 is biased by spring 224 in a downward direction together with plate 218, plate 218 being guided by pin 225 which slidably engages aperture 226 in bracket 221. By means of timing belt 227 which passes over pulley 123 on shaft 120, idler pulley 229 and pulley 230 both of which are mounted on plate 106, and pulley 231 rotatably mounted on shaft 232, shaft 232 and cam 234 are rotated through clutch 233 forming a part of pulley 231 in a manner described with respect to clutch 132, see FIGS. 3 and 6. Shaft 232 has cams GLA and GLB fixed thereto for actuating normally closed contacts GLAl and GLA2 and normally open contacts GLBl and GLBZ. The operation of clutch 233 is controlled by solenoid GL mounted on plate 106, the armature 235 of which is pivotally connected at 236 to arms 237 and 238 of hell crank levers 239 and 240, as shown in FIG. 6, arms 241 and 242 serving to limit clutch 233 to one-half revolution in the same manner as clutches 132 and 201 and levers 239 and 240 being pivotally mounted at 243 and 244. Upon energization of solenoid GL, clutch 233 is engaged to permit a half revolution of shaft 232 and cam 234 which then permits shaft 220 and its associated parts to be moved in a downward direction by spring 224 whereby platen 217 engages carrier 85 and overlies element 30. With platen 217 in its engaging position, roller 245 engages the edge of plate 86 and as carrier means 85 is moved intermittently to the right, as viewed in FIG. 2, platen 217, plate 218 and bracket 221 are moved therewith along rods 222 and 223 with cam 234 riding along arm 246 fixed to shaft 220. Cam 234 is retained in this position until the last image 12 is moved into projecting station 56 and the projection thereof has been made. Immediately after projection, or after movement into station 56, depending on whether images 11 and 12 are to be projected, solenoid GL is again energized. With the energization of solenoid GL, cam 234 again makes a half revolution to raise shaft 220 and its associated parts to the position'in which platen 217 is clear of carriage means 85. When spring 224 moves shaft 220 downwardly due to rotation of cam 234, the end 247 of shaft 220 abuts collar 248 which is fixed to the end of vacuum line 249. As a result, a vacuum is applied to platen 217 during the interval it is in engagement with carrier means to maintain element 30 in a flat condition during projection. In order to prevent element 30 from sticking to platen 217 when platen 217 is raised, line 249 can be interconnected with a pressure source whereby upon movement of end 247 away from collar 246, a slight blast of air is delivered to line 249 and to shaft 220 to blow element 30 from platen 217.

The means for intermittently moving carrier 85 through projecting station 56, see FIGS. 6 and 7, comprises a pawl 250 which is eccentrically mounted on shaft 251 journaled in plate 106. Shaft 251 carries cams ICA, ICE and ICC for actuating normally closed contact ICA1 and normally open contacts I'CB1 and ICCl and is rotated by a single revolution clutch 252 which, in turn, is rotated by pulley 230. Clutch 252 is released by link 253 pivotally mounted on plate 106 at 254 and pivotally connected to armature 255 of solenoid IC at 256, said link being biased by spring 257 into the path of clutch 252. Upon each actuation by solenoid IC, clutch 252 is released and shaft 251 is rotated whereby pawl 250 is moved into engagement with one of the teeth 98 on block 97 to move the next image into position with respect to axis 0A in projecting station 56. By means of pawl 258 which is pivotally mounted on plate 106 at 259 and biased toward teeth 98 by spring 260, each image longitudinally of element 30 is correctly and properly positioned with respect to optical axis 0A since pawl 258 serves as a locating means for carrier 85 as well as a stop to prevent retrograde movement of carrier 85 by means of spring 114. A third pawl 261 is pivotally mounted at 262 on plate 106 and biased toward carrier 85 by spring 263. Pawl-261 engages one of the teeth 98 on block 97 to hold carrier 85 in position with respect to receiving station 51 as element 30 is removed therefrom by plunger 185 for insertion into magazine 50. In order to disengage pawls 250 and 258 from teeth '98 for reasons to be described hereinafter, solenoid CR1 on plate 106 has a member 264 provided with a hook portion 265 connected to its armature 266. A similar member 26 7 having a hook 268 which engages pawl 261 is attached to armature 269 of solenoid CR2. When solenoids CR1 and CR2 are energized, hooks 265 and 268 rotate pawls 250, 258 and 261 in a clockwise direction and withdraw them to a position in which they cannot operatively engage teeth 98. As a result, carrier 85 can be moved by spring motor 115 from either projecting station 56 or receiving station 51 to supply station 41 independent of the drive from motor 100. In order to ease carrier means 85 into the home position, a shock absorber 270 is mounted on support 45 and between rods 94 and for engaging adjustable stop 96 on support 87. By use of a suitable one-way friction brake applied to core 111, the speed or rate at which belt 118 is moved can be adjusted to control the movement of carrier means 85 as it is moved from its home position toward projecting station '56 and receiving station 51.

When carrier 85 is in position with respect to supply station 41, or the home position, switch CH having contacts CH1, CH2, CH3 and CH4 is actuated thereby. As carrier means 85 is moved toward reading station 74, it actuates switch CX having normally open contacts OX1 and CX2 and upon leaving the reading station actuates switch CY having normally open contacts CY1 and CY2. Upon movement into projecting station 56 switch CES having a normally closed contact CESI and a normally open contact CES2 is actuated by carrier means 85 and when in the receiving station 51 switch EC having normally open contact EC1 and normally closed contact B02 is actuated thereby. The function of'switches CH,

CX, CY, CBS and EC will be described more fully in conjunction with the description of the circuit diagrams hereinafter.

As shown in FIG. 3, a plurality of cams LCA, LCE and LCO are fixed to the lower end of shaft 200 and actuate a group of contacts LCA1 (normally closed),

LCEl, LCE2 and LCE3 (normally open), and LCO'l and LCO2 (normally closed). These contacts are associated with the circuit for controlling the transverse shifting of the optical system and housing 57 by cam 213. On frame 46, as shown in FIG. 2, a rotary solenoid S carries shutter 275 for blocking any transmission of light to exposure station 276. In order to control the exposure, a timer is utilized having a contact EXPl within the timer that closes when the timer is in its timed out position and a contact EXP2 within the timer that closes when the timer is timing; such a timer is commercially available under the name of Microflex Reset Timer and is manufactured by the Eagle Signal Corporation. The timer contacts EXP1 and EXP2 are connected into the control circuitry as shown in FIG. 19B.

Exposure station 276, as shown in FIG. 8 and out of position in FIG. 1, comprises an area aligned with projecting station 56 through which the unexposed lightsensitive material or paper 277 is advanced intermittently and in proper timed relation to the movement of element tank 282. Since any well-known mechanism for intermittently advancing equal lengths of paper 277 into exposure station 276 can be utilized, such as are used in Photostat Copying Machines and similar apparatus, a detailed description of such a mechanism is believed not to be necessary. As shown in FIG. 1, paper 277, after exposure, can be moved beneath a severing knife 283 and then cut into the required length, the severed piece then being moved by conveyor 284 through a path similar to that described above to processor 282, the next exposure then being made on the length of paper just moved into exposure station 276. While the drawings disclose for reasons of clarity no cabinet or covering for the apparatus, it is to be understood that with the exception of housing 57, magazines 40 and 50, reading station 74 and carrier means 85, the entire mechanism and frame 46 are completely enclosed by a light-tight cabinet to permit said apparatus to be used under normal light conditions.

The machine described hereinabove is utilized for projecting all images, abstract images or selected images onto the paper 277 in exposure station 276. It is assumed that elements 30 are negatives, that magazine 40 contains a stack of elements 30 and that carrier means 85 is in its home position with respect to magazine 40. In FIGS. 19A, 19B, 20A, 20B and 20C all contacts are shown as they would appear when the carriage is in the home position. The machine is said to be in the normal starting position when carrier means 85 is in the home position, glass platen 217 is in its raised position and plunger 163 is in a position for removing the lowermost element 30 in magazine 40 and positioning it on carrier means 85. A discussion of the machines operation when various elements are not in their normal starting position will be discussed hereinafter and the following description relates to a complete operating cycle in which the interrelationship of the mechanical and electrical components is set forth.

Assuming the normal starting position, relay BO will be the only electromagnetic device energized when line switch LS is closed, and carrier means 85 will be in engagement with switch CH. In FIG. 19B actuating start button 285 completes a path from ground potential through GLAl, CH1, MCA1, the momentarily closed contacts of the start button, and A1 to relay A and the positive side of the line. By this path relay A is energized and picks up contacts A3 and A4 which are then closed and contact A1 is moved to its other position. Relay A is locked up on the path from ground through the normally closed contacts of the stop button 286 and contacts RS1 and A1 to the positive side of the line. Closure of contact A3 places solenoid MC across the line by means of contacts GLAI, CH1, MCA1 and A3. After approximately 50 milliseconds MCA1 and MCA2 open. The opening of MCA1 makes it possible for clutch 132 to turn only one-half of a revolution because it causes solenoid MC to be de-energized. This onehalf revolution of clutch 132 causes cam 155 to oscillate bell crank lever 157 whereby the lowermost element in magazine 40 is withdrawn from said magazine by plunger 163 and deposited on plate 86 and with respect to aperture 88. The opening of contact MCA2 prevents actuation of relays CR1 and CR2. About 180 milliseconds after clutch 132 is released plunger 163 will be clear of plate 86 and contacts MCBI and MCB2 are then closed, see FIG. 18. Contact MCB2 makes available a positive 40 volts to the cells 78, 79, and 81, see FIG. 19A.

The closing of contact MCBl provides two paths to energize carriage clutch CC, one path being via contacts MCBl, RS4, CESl, GLA2 and EC2 and the other being through contacts MCBI, RS4, M1 and EC2. When clutch CC is energized, carrier means is moved from the horns position or supply station 41, past reading station 74 and into the projecting station 56. As carrier means 85 leaves the home position, switch CH is actuated and contact CH1 opens and contacts CH2, CH3 and CH4 close, contact CH4 placing shutter solenoid S across the line to actuate shutter 275 to a position in which an unobstructed path is provided between projecting station 56 and exposure station 276 for projection of an image. As carrier means 85 is moved by timing belt 118 towards reading station 74, carrier means 85 closes contacts CX1 and CX2 to apply the 40 volt potential across the lightsensitive cells. As element 30 is moved through reading station 74, a signal is derived by cell 80 from each of reference marks 34, a signal is derived by cells 78 and 79 from indicia 35 and indicia 36 for projecting only the abstract images, a signal is derived by cell 79 from indicia 36 depending on whether all or selected images are being projected and a signal is derived by cell 81 from apertures 93. The position of selector switch 287 determines whether the signal from cells 78 and 79 or cell 79 is to be used, switch 287 being open to project abstract images and closed to project all or selected images. Amplifiers 288, 289, 290 and 291 amplify the signals derived from cells 78, 79, 80 and 81, respectively, and the output signals from these amplifiers is delivered to trigger circuits 292, 292', 293 and 293 as shown in FIG. 19A, the trigger circuits being identical and shown in detail in FIG. 20A. From the signals delivered to trigger circuits 292 and 292, four possible signals can be delivered to cathode follower circuits 294 and 294' and these output signals are then delivered to a diode matrix 295. The signal from amplifier 290 and which is delivered to trigger circuit 293 is directed toa cathode follower circuit 296 and then to a detection device 297 which is shown in detail in FIG. 20B and which emits a signal only when there is an absence of reference marks 34 on element 30. The signal delivered to trigger circuit 293 from amplifier 291 is directed to cathode follower circuit 298. The output of cathode follower 298 is delivered to or gate 311, to cathode follower 300 and to single shot delay multivibrator 301. The output from cathode follower 300 is delivered to pulse generator 302 and the output from mutivibrator 301 is delivered to single shot multivibrator 303, to cathode follower 304 and to pulse generator 303. The signal delivered by or gate 311 is directed through cathode follower 314 to relay M and to trigger circuit 299 whose output is directed through single shot delay multivibrator 305, single shot multivibrator 306 and to cathode follower 307 whose The output from cathode followers 298 and 298' are fed into or gate 311 which has the property that when a signal is derived from cell 81 and no signal is derived from cell 80 it permits the signal from cells 78 and 79 or cell 78 and no signal from cell 79, to be transmitted to cathode follower 314. The other output signal from trigger circuit 310 is connected to the control grid of thyratron 312, as shown in FIG. 19B, and the output from cathode follower 314 is connected to the control grid of thyratron 313.

The output from the or gate 311 is the signal delivered to cathode follower 314, the output of which is delivered to trigger circuit 299, multivibrator circuits 305 and 306 and cathode follower 307, the output of which is to register memory 308. This output signal from cathode follower 307 serves to store in the magnetic core memory unit 308 a signal for each image to be projected as element 30 is moved through projecting station 56. In order to better understand the function of the amplifier, trigger and cathode follower circuits a more detailed description will be given in connection with FIG. 20A in which one group of the circuits is shown.

The amplifier circuit 288, trigger circuit 292 and cathode follower circuit 294, as shown in FIG. 20A, are identical to the corresponding circuits associated with cells 79, 80 and 81. Amplifier circuit 288 comprises two stages and the amplification of the polarizing voltage made available by the closing of contact MCB2 applies a large positive input voltage. The signals derived from cells 78, 79, 80 and 81 are negative going signals. The input stage of each amplifier must clamp to positive going signals and have a long time constant to prevent sag or decay during the relatively long polarizing voltage time. This clamping point is equivalent to the dark condition of a cell, and a light condition or clear film portion will cause a negative signal to be produced. An opaque density between dark and light, or a system that is frequency limited by the time constant of the sensing cell, will cause the positive portion of the'signal to lie between the true dark and the light condition of the cell. Clamping the positive polarizing voltage to ground will cause the derived signals to be amplified and if the signal magnitude is large enough, the tube will be cut off.

The second stage of amplifier circuit 288 clamps on a negative going signal and its operating point is chosen just slightly beyond the cut-off point of the tube. Hence, positive signals are amplified and some signal to noise advantage may be obtained by adjustment of the bias point, the bias being derived from a cathode follower voltage divider. A negative polarizing voltage of equivalent amplitude and width is applied to the cells to prevent them from becoming polarized as will be described hereinafter.

The output of amplifier 288 is D.C. coupled to the Schmitt trigger circuit 292 which provides both a negative and positive signal to drive the diode decoding matrix 295 via cathode follower circuit 294. Trigger circuit 292 is made from the single shot multivibrator circuit, as shown in FIG. 200, by removing the cathode by-pass condenser 315 and not using the external cross coupling condenser 316. Normally in trigger circuit 292, one tube is conducting and the other is nonconducting. When the grid potential of the conducting side is lowered, a positive amplified voltage is produced in the tube plate circuit and this plate voltage, which is D.C. coupled to the grid of the second tube, drives this tube to the conducting region. Because of the common cathode coupling, a regenerative condition exists during this transition and the tube remains in this new state until the grid of the-first-mentioned tube is again made positive.

absence of such reference marks.

The output of the Schmitt trigger circuit 292 feeds two cathode followers, broadly designated by the numeral 294 in FIG. 20A, which provide a low impedence source to drive the diode matrix 295. Switches N and P in the output lines of trigger circuit 292 are provided to make use of the negative and positive output signals in accordance with the type of film being used; that is, if elements 30 are negatives, switches N will be closed, but if elements 30 are positives, then switches P will be closed.

"The diode matrix 295 which is a mixing circuit includes an or circuit 311. An output signal is inhibited unless both diodes are in the proper state, four possible outputs being available from the two image cells 78 and 79. Since the complement of the selected images is punched in the element 30 by means of apertures 37, the selected image information is handled in a manner similar to that of the all image condition. The complementing leaves the desired indicia 36 and punches out the same indicia which are not required for the images to be projected.

The signal derived from cell 80 by means of reference marks 34 are handled in a manner similar to that described above but have an additional'circuit to detect the Such a circuit is dis closed in FIG. 2013 in which cathode follower circuits 296 and 309 and detecting circuit 297 are disclosed in detail. The output of trigger circuit 293 is coupled by cathode follower circuit 296 to detection circuit 297. The output of the circuit 297 is coupled by cathode follower circuit 309 to another trigger circuit 310. The detecting circuit 297 comprises a RC combination whose time constant is chosen to change the orientation of trigger circuit 310 during the presence of reference marks 34. The RC combination in circuit 297 must decay to cause the trigger circuit 310' to reorientate when two or three of reference marks 34 are absent so that thyratron 312 cannot be fired by a single pulse. The reorientation of trigger circuit 310 fires thyratron 312 in the circuit of relay G and applies the proper voltage to or gate 311.

In FIG. 20C a detailed circuit is disclosed of the single shot delay multivibrator 301 and the single shot multivibrator 303 which are shown in block form in FIG. 19A.

In each of these multivibrator circuits the delay period can be adjusted by changing the value of the cross coupling condenser 318, this condenser and resistor 317 determining the actual time delay period. The positive output of the delay multivibrator is differentiated and the negative pulse is used to drive another multivibrator. This latter signal is fed to cathode follower circuit 307 which, in turn, feeds the magnetic memory register 308. The cathode follower circuits 300, 304, 307 and 317 are the same as that disclosed in detail in FIG. 2013. The pulse generator circuits 302 and 303 can be any conventional circuit which will provide shift pulses to magnetic memory 308 such that the first pulse corresponds timewise with the pulse delivered to magnetic memory 308 from cathode follower 307 and a second pulse which is delivered to magnetic memory 308 before the next pulse is delivered thereto from cathode follower 307. As a result, it is evident that two shift pulses are necessary since two magnetic cores representing an image are utilized. The timing for the shift pulses are controlled by cell 81 and its associated circuits as shown in FIG. 19A. Within the projecting station 56 the image data stored in magnetic memory 308 is pulsed out as described hereinafter to actuate relays E and O, the logic of relays E (even numbered images) and 0 (odd numbered images) being used to control the projecting function. 1

For the purpose of discussion with respect to the circuits disclosed in FIG. 19B, it is assumed that reference marks 34 were detected on element 30 and that at least one image is to be projected into exposure station 276. Under these conditions, both relays G and M are activated, the instants of nonactivation of relays G and M 13 being discussed hereinafter inasmuch as they occur less frequently.

Since relays G and M are activated by the signals delivered to thyratrons 312 and 313, contact M2 closes and contacts M1 and G2 open and relay G then locks up on the path through contact CH2 while relay M locks up on the path through MCBI, RS4 and RS5. As carrier means 85 leaves reading station 74 contacts CXl and CX2 open so that no potential is applied across cells 78, 79, 80 and 81. However, as carrier means 85 continues to be driven at a uniform rate toward projecting station 56, it actuates switch CY whereby contacts CY1 and CY2 are closed to apply an opposite polarizing voltage to the cells and, therefore, conditions the cells for the succeeding element 30 that is to be moved through the reading station 74. As carrier means 85 approaches projecting station 56, it actuates switch CES which opens contact CESl and closes contact CES2. With the opening of contact CESl, clutch CC is de-energized and carrier means 85 comes to rest in projecting station 56 with the central portion of the first ten rows of code aligned with optical axis A. The closure of contact CES2 energizes relay CE about 25 milliseconds after the carrier means 85 enters projecting station 56 and when relay CE is energized, contacts CEI, CE2 and CE4 close and contact CE3 opens. The closure of contact CE2 provides a path through contacts GLA1, CB2 and M2 to energize solenoid GL which causes clutch 231 to be released whereby cam 234 permits spring 224 to move glass platen 217 into contact with the element 30 on carrier means 85. Approximately 50 milliseconds later, contacts GLA1 and GLA2 open, the opening of GLA1 de-energizing solenoid GL and permitting clutch 231 to make only one-half a revolution. After approximately 180 milliseconds, contacts GLBl and GLB2 close, and at this time glass platen 217 is in position and holding element 30 flat on carrier means 85. At this time the vacuum is applied to shaft 220 and to platen 217 for holding the element 30 flat during projection of the images thereon.

With the closure of GLB2, a path is provided through ICAl, GLB2, E4, 04 and CE4 to energize solenoid IC and actuate clutch 201. Since 24 stepping pulses were generated as element 30 was moved through reading station 74, the first bit of information must reside in core 1. With the energization of solenoid IC, pawl 253 releases clutch 252 and permits rotation of shaft 251 whereby pawl 250 engages a tooth 98 on block 97 and moves image 1 into position with respect to optical axis 0A. As shaft 251 makes a complete revolution, cam ICB closes contact ICB1 to generate a pulse which moves the information from the prime cores to the unprimed cores. A second shift pulse is generated by carn ICC as it closes contact ICC1 and shifts the information to the next prime cores. In this same revolution of shaft 251, cam ICB again closes contact ICB1 to generate a third shift pulse which moves the information to the next unprimed cores and contact ICC1 is again closed by cam ICC to generate the fourth and final shift pulse which moves the information out of memory unit 308 to energize relays E and 0, the periods of operation of cams ICE and ICC being shown in FIG. 18. To make this process of shifting more clear, assume a bit of information in core 1'. The first shift pulse sends this information to core 1, the second shift pulse moves the bit of information to core 0', the third pulse moves it to core 0 and the fourth pulse moves it out and into relay 0. A bit of information at first residing in core 2 ends up after four shift pulses in energizing relay E. Of course, if cores 1 and 2' contain no information, relays O and E will not be energized. A lack of information in a core, therefore, means that the image area represented by that core is not to be projected, and the energization of relay E and/or 0 means that some projecting is to be done. If no information resides in cores 1' and 2' neither relay E nor relay 0 will be energized. Hence, as soon as image clutch 252 is released contact ICAl is opened to limit clutch 252 to a single revolution, and upon completion of the single revolution a path will again be provided via ICAl, GLB2, E4, 04 and CE4 to energize relay IC. The energization of relay IC serves to step the carrier means one image position and shift two more bits of information into relays E and 0.

If relay E is energized but relay 0 is not, and optical axis 0A is aligned with any one of the even images 2-12, contact LCE2 is closed by cam LCE, see FIG. 18, and a path via ICAl, GLB2, E5, 05, and LCE2 energizes exposure relay F. With the energization of relay F, contact F1 shifts and contact F2 closes, relay F locking up on path ICAl, GLB2, LCAl, and F1. The closure of F2 energizes the timer by means of relay EX. As soon as the timer begins to time, contact EXP2 closes and completes a circuit through the projection lamp 64. As long as lamp 64 is in an operative condition relay BO remains energized. Once the interval set on the timer elapses, contact EXP2 opens and EXPl closes, the closure of contact EXPl activating the timed-out relay T0. As relay T0 picks up, contacts T01, T02, T03 close and solenoid IC is energized via contacts E3, 03, T01 and CE4 to release clutch 252. The closure of contact T03 initiates solenoid PA to release the paper advancing mechanism and during the inteival the paper is being advanced com tact PA1 in the circuit of relay F is opened so that another exposure cannot be made while paper 277 is being advanced. As shaft 251 rotates, contact lCAl opens to deenergize relay F, E and 0 and also advances carrier means 85 one image position and causes the information in the memory unit 308 to be shifted. The opening of contact F2 permits the timer to reset and as this occurs, contact EXP1 is again opened. Thus, relay T0 is de-energized and contacts T01, T02 and T03 are opened. In this instance, the optical axis 0A is aligned with the proper image so that exposure or projection first takes place. After exposure, paper 277 is advanced and then carrier means 85 is advanced to position the next image in alignment with optical axis OA.

If relay E is energized and relay 0 is not, and optical axis 0A is in position with respect to any one of the odd images 1-11, a path via contacts ICAI, GLB2, E5, 05 and LCO1 energizes solenoid LC to release clutch 201. As shaft 200 is rotated by clutch 201, contact LCO1 is opened before contact LCE2 closes to permit shaft 200 to make only a half revolution thereby activating exposure relay F via contacts ICAl, GLB2, E5, 05 and LCE2. The exposure and energization of relays T0 and PA follow as described in the previous paragraph. It is to be understood, of course, that in these descriptions energization of relay E means that its respective contacts E2, E4 and E6 open and contacts E3, E5 and E7 close. Likewise, with energization of relay 0, contacts 03, O4 and 05 open and contacts 02, 06 and 07 close. Under these conditions, optical axis 0A is aligned with an odd image and it is required to expose the even image in the same transverse group. As a result, housing 57 must first be shifted after which exposure and paper advance follow in the normal order.

If relay 0 is energized and relay E is not, and optical axis 0A is in position with respect to any one of the odd images 1-11, relay F is energized via contacts ICAI, GLB2, E6, 06, LC02 and F1. The exposure is made in the same manner as previously described until relay T0 is energized. Solenoid IC is then activated via contacts E2, 02, T01, and CE4 to release clutch 252 whereby carrier means 85 is moved to the right one image position by pawl 250. Relay B is then actuated via contacts ICAl, GLB2, E6, 06, B3, T02 and B1 and locks up via contacts B1, GLB2 and ICA1. When relay B locks up, contacts B1, B2 and B4 close and contact B3 opens. In this way, solenoid LC is activated via contacts B2 and LCO1. With the energization of solenoid LC, clutch 201 is released and cam 213 shifts optical axis 0A into position with respect to the images 2-12. As shaft 251 rotates, contact ICA1 opens and relays B, F, E and O are deenergized. Shaft 200 makes, therefore, only a half revolution whereby optical axis A is aligned in the even position. With this set of conditions, optical axis 0A is properly aligned so that exposure and paper advance first take place followed by movement of carrier means 85 and shifting of said optical axis.

If relay 0 is energized but relay E is not and optical axis 0A is aligned with any one of the even images 2-12, then solenoid LC is energized via contacts ICA1, GLB2, E6, 06, and LCE1. As shaft 200 rotates with the release of clutch 20 1, contact LCEl opens before contact LCO2 closes. The opening of LCEl makes it possible for shaft 200 to make only a half revolution and the closure of contact LCO2 activates relay F. The sequence of operation then continues as described in the previous paragraph. Under these conditions, optical axis OA must first be aligned with the proper image before exposure can take place.

If both relay E and relay 0 are energized and optical axis 0A is positioned with respect to any one of the odd images 1-11, relay F is energized immediately via contacts ICA1, GLB2, E7 07, B3, and LCO2. Operation then continues as usual until relay T0 is energized. Relay B is then activated via contacts ICA1, GLB2, E7, 07, and T02 and as relay B picks up, contacts B1, B2 and B4 close and contact B3 opens. Relay B, therefore, locks up on the path ICA1, GLB2 and B1. Solenoid LC is then energized via contacts B2 and LCOl and as shaft 200 rotates contacts LCAl, LCOl and LCO2 are opened. The opening of contact LCA1 de-energizes relay F and the opening of contact LCOl permits shaft 200 to make only a half revolution. As shaft 200 continues to rotate contacts LCAl, LCEl, LCE2 and LCE3 close and relay F is activated via contacts B2 and LCE2, the exposure then being made in the usual manner. When relay T0 is picked up, solenoid IC is energized via contacts B4, LCE3, T01 and CB4 to release clutch 252 and permit rotation of shaft 230 to move carrier means 85 one image position to the right. As shaft 251 rotates, contact ICA1 is opened and relays B, F, E and O are then de-energized. This set of conditions exists in the normal cycle of operation for projecting all images. Since optical axis 0A is aligned with an odd image and if it is assumed that it is image 1, then exposure occurs first and is followed by advancement of paper 277 and then shifting of the optical axis into alignment with the even image. Exposure is then made folloswed by the paper advance and shifting of carrier means If both relay E and relay 0 are energized and optical axis 0A is in position with respect to any one of the even images 2-12, solenoid LC is energized via contacts ICA1, GLB2, E7, 07, B3 and LCE1. As shaft 200 rotates con tacts LCEl, LCE2 and LCE3 are opened to allow only one-half revolution of said shaft; and as it continues: to rotate, contacts LCO1 and LCO2 are closed. Relay F is energized via contacts ICA1, GLB2, E7, 07, B3 and LCO2 and operation then continues as described in the previous paragraph. This follows the set of conditions described in the previous paragraph. Since optical axis 0A is aligned with an even image it is necessary to first shift said optical axis after which the functions just prevlously described follow as outlined above.

Switch CBS is again actuated as soon as carrier means 85 reaches a position in which the images 11 and 12, or the sixth and final image group, are aligned with the optical axis CA. With the actuation of switch CES, contact CESl closes and contact CES2 opens, the opening of contacts CES2 de-energizing relay CE. When the signal that normally energizes solenoid IC arrives via contacts E2, 02, and T01; contacts E3, 03 and T01; contacts B4, LCE3, and'TOl; or contacts ICA1, GLB2, E4, and 04 it is directed via contact'CE3 to energize solenoid GL.

With the energization of solenoid GL, clutch 233 is released to permit rotation of shaft 232 and movement of glass platen 217 into its raised position by earn 234. As shaft 232 rotates, contacts GLBl, GLB2, and GLB3 open and the opening of contact GLB2 de-energizes relays B, F, E and O to permit only one-half revolution of shaft 232. As platen 217 is raised, a blast of air is directed against element 30 to insure that it does not adhere to: the platen. As regards the completion of rotation of shaft 232, contacts GLAI and GLA2 are closed at a point in which glass platen 217 is safely clear of carrier means 85. The closing of contact GLA2 provides a path via contacts MCB1, RS4, CESl, GLA2, and EC2 to energize clutch CC which connects the drive for belt 118 to motor whereby carrier means 85 is moved at a uniform rate from projecting station 56 to receiving station 51.

When carrier means 85 reaches its position with respect to receiving station 51, it actuates switch EC thereby opening contact EC2 and closing contact EC1. The opening of contact EC2 de-energizes clutch CC to arrest further movement of carrier means 85. The closure of contact E01 provides a path via contacts MCB1 and EC1 to energize solenoid MC and permit only a half revolution of shaft 130. As shaft 130 rotates, contacts MCB1 and MCB2 are opened, the opening of MCB1 allowing only a half revolution of shaft 130. With carrier means 85 in position with respect to receiving station 51, plunger 185 is actuated by the rotation of shaft 130 to remove the element 30'- from carrier means 85 and to insert it in receiving magazine 50. As soon as the plunger 185 has insented element 30 into magazine 50 and has returned to its original position, contacts MCAl and MCA2 are closed, the closure of contact MCA2 energizing the carriage release solenoids CR1 and CR2 via contacts GLAll, CH3, and MCA2. With the energization of solenoids CR1 and CR2, pawls 250, 258, and 261 are moved to a position in which carrier means 85 can be moved thereover.

With the release of carrier means 85 when in position with respect to receiving station 51, spring motor returns carrier means 85 to its home position with respect to supply station 41 and atthe start of this movement switch EC is again actuated whereby contact EC2 is closed and contact B01 is opened. When carrier means 85 reaches the home position with respect to supply station 41, contact CH1 is closed and contacts CH2, CH3 and CH4 are opened, the opening of contacts CH3 and CH4 de-energizing solenoids CR1. and CR2 and shutter solenoid S, respectively. The opening of contact CH2 de-energizes relay G and the closure of contact CH1 provides a path via contacts GLA1, CH1, MCA1 and A3 to again energize solenoid MC for removing the succeeding lowermost element 30 from magazine 40. The cycle then repeats itself as already described.

If the stop button 286 is actuated any time during the cycle of operation, relay A is de-energized and contacts A1, A5 and A4 are opened. Stop button 286 has no effect on the operation until the end of the cycle at which time there is no path provided to energize solenoid MC.

If reset button 3-21 is actuated at some point in the cycle of operation, relay RS is energized to'close contacts R82 and RS3 and open contacts RS1, RS4 and RS5. The opening of contact RS1 de-energizes relay A and opening of contact RS4 prohibits the energizing of clutch CC. If the glass platen 217 is down, solenoid GL is activated via contacts RS2 and GLBI. Since contact GLBI opens as shaft 232 rotates, the shaft can only make one-half revolution. If solenoid MC is in the eject, i.e. in position for actuating plunger 185' and inserting the element 30 into receiving magazine 50, it is energized via contacts MCB1 and RS3; As shaft rotates, contact MCB1 opens to allowonly one-half revolution of said shaft. When plunger has returned to its original position, contact MCA2 closes and relays CR1 and CR2 are en- .ergi'zed to release carriage means 85'. Thus, the effect of pushing reset button 321 when the machine is in mid- 

